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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ef3e5b5a884bc43ec79d85582e78152191c2f89d14a55bb104330d917b6c356' 
  AND token = '8GHQ8G1Hr4bDMO/tVGJcZW15ZFCAwWi+P8M+Fx2T624=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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