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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dd88012389b399035279de4dd1cc11f53310b64a068f8933d74f62f87c22ea5' 
  AND token = 'BxQOflYB3RP80Xo4coQDP43go7eo6t75Tq3s9DR99u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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