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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6059b0908e9e429c95a87d137128c2d28e7c785ba7176e41bb4274e8d2de4697' 
  AND token = 'FsXrEp7g0q2x7rOfCSoJPNE/z1Hjxk90fse5Zk3/i2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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