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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3ed150b9f5fc2251fd1f60c278bf3dd3f3fee8131a377c26b066e1a095ee94' 
  AND token = 'q3yXeFymEAPCsRazGTXffSMYBxw8Nb4pZemSXCOI53o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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