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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91f44259882ce575bb2863abb9dac54a1a6f6e5009970dc386c04c2913821359' 
  AND token = 'o2vhIO4rAX1l0PBaXW7+9YJ3Uai2Upf+RZYZW0v9p4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}