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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '540c556b6f530a2d14d83737ff1223d9e0a646239383a845bd1561e7a21404af' 
  AND token = 'mTFOx71lP4vwnN7hcqdJ05EAaOjeDVas5lIOUYv7MyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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