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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6638b3b3968729f0d5f89a1415993a2fd71ddd144262062649992cb2d838008' 
  AND token = 'eqgV1aLFBULxpQgLn6sHUkLMWhLYxe7fmt3n+TTHBfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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