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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9477f3f2697ce41413b725478c872d54f9e6c922f14a43221dab9f11c44d937' 
  AND token = 'TwnGGWDKKkqWrTyMi3wNxEAKSDqbj9Kl3US3qQ2VY/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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