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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e71f409459f8c7270cc4bec8e9edb9b666b8448e24e86818eb0fdc0eb6dafb' 
  AND token = 'nOO4rOmWyu+tWhQdAFTP2C7Nh3tmOD7cNmFeMgvHabE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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