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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1895da4c5e128c2b8ef6f11a46f1eef3ba5f0a1d68c3bc25cb94ba593d84a7c9' 
  AND token = '1eOaoLC2r8s2Mc/apRXi7l5Kv1dRxkkrvbD/hGEIt10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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