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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa98ad6b71a6fe860c3175cf423af7e033ff8ffd792891c7874cdaa0b414eff' 
  AND token = 'unrbQ0rcdCO8KMGL37SJ7jvyqqvWXIiNqT1/eTz20qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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