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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e6360395c6d4aa009a96c6d777bc06363f28c7bc256e41e2553c62f02489096' 
  AND token = 'hzJlclR2tnuTGiSJAM0x4kkTqckP/5+ebmY6fkgkcBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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