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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '607192fcb947ffc3ccbe6a5a35f948b401d32dbd0575a85f3a5e6bde6bd78c18' 
  AND token = '+MSaED9zzXAUkaQE7HGPI18TpxtU3MavP99ldKQPMGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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