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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e505bdc75b1e156cb2380629a0ab1ae18f771d0804a758c6eafb6b0439275d0' 
  AND token = 'euLpEURJgYaG7QOuBYyl1wf39FbRgC7ecOgSi7rb8QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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