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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '190bdd08d2ed257f2d64da7c47811f2753e184e62a8f4ef81812d26d85a560e2' 
  AND token = 'du8K67OfE4SKJ9X4HnipdOUny9O9PGlr5hF9+0KSNkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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