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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25a0a1f5c0c3c0e11aaa8e50244fe123fb561bed9823968086b7cac4d7f86818' 
  AND token = 'cjKIRMh7dSArX5cx9OpZkjAVxLGsMps8C4D6o/uKNDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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