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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5035f9a0ffb135ae35b7a5c12791f164f2400f621249b64e4a1a0c5c6a801d6' 
  AND token = 'AHcmkCCODCzT945erhHDJQOuoC2aSPkgqOfRUb20WkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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