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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda9ec3e159f24e452b6eb6b3739853736cbda083689c6e25a1085721f073c6d' 
  AND token = 'ZFa1Nzn7f6FVj8E1X5JBoONEwQCTarSp8UVQw5yOHrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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