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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900aeb18bf5b0f97ec53b53a995f03c219a6e57724539eecfd96d7cf552c70ee' 
  AND token = 'YvetltkWLtsZmQKnSa7E7a4ANFHHOiXivGD6NwdiiwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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