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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11556bc8b0da940d38e6f9d19651dce9ba0f7bf105055390a5996f09b71b0f8c' 
  AND token = 'swK5zv6S0Qk3K7qxfLsFKre3adLr8QmXHe4Ukb/DMqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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