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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d30ab9c9bb1fbc29e69529c144ca177a4917ea2e592dc4ce84764be1e423dd' 
  AND token = 'isz2Sa9L2qznkOSw+drvUghUhMd5PZinWPy6z1EQS6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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