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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c761cf2ebe09ba8564f8addc18a82a2f02cd6476d32ec70ace5ba91d7d798b1' 
  AND token = 'ueZWF2R78V+SlBXn9qiJYWi9WjWL4kDVbLt20sJ1G5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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