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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8a93992936aaf9bcb97f6582aa5feb90916c1a04b17c8699d954f5cc887969' 
  AND token = 'fV33DOjj/f1ohiid/XrDjrMjmmq24sz2PkXgEX4wf6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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