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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0fb6429b59ce6d752f7201e42de0e9c65310bcd0b9c3b1b9fff4145545b8c7' 
  AND token = '3g8K6tBUxkFf9p6Ys1Ph/X2m8PytWdtebNftUSSmdFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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