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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f87db61114e239a6c84894efe3295619aad9417c9d7ccf19b1ec46dd7a7fb1ea' 
  AND token = 'P7JlzqFe7z6SBgdZL3purkiAJmanqUopulhTZrpC0zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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