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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3c1fa7ea800ca0de37500398c36c3ac5093ecd04b4ca3479e5a28dd306b088' 
  AND token = 'Fz4SuNeaCvKIW15SQvaV7w53bIpTE6/p4hNFo/wAYqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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