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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4d608b28cb057f1a085c17c04866177f9132f18d5bf812f791d80e94c49b0ac' 
  AND token = 'G0T1PLvDIqoxSrpE7l18gD+yQSu6DPpbQgEFUXgeRT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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