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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c94650b96cafbbb70e92673a8ca8ec1b7976c30a383d0b1626326171c10b090' 
  AND token = '60S2XBU4vlfFPSHi8Zd0Lzr3jdOs7dCD0iqfazcxijY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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