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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '565c2062b3c727f97b51a96ac1b6bea4f4f5ef332141e3bc0a3aabbf849d6e15' 
  AND token = 'lwuHezdi8bQSppQJwabWlGMUdVmYcbiYRmA1Z8V+e+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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