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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ca53d7cad97e62fb12844f7fe440388b9ebf163923acef59c756edb9c31f5ae' 
  AND token = 'PDEBGD4Wocn5LWA+0K3q8ryrHjSx3Kf+btOhG/rS3Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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