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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a70e2c68be446e22ecfa57ef5db432fd2f5a7e44857517a021cbcdefd77094' 
  AND token = '+yj62b5e/ycUwXxEtdYe2BfaTART7g6fHsPEK1xEWbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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