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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddcd917a605b90f6f40ea976ce7f87efa6279cfbc631a5a5e5e74fdba2d47c92' 
  AND token = 'E4h+6ZCm7h8O+qHQMIc5WQZ6flDeBeAsr1ZAfzhzgPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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