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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '940e00a45ac32471796345698ae003c208e067798c8b781a75645660ca1f3822' 
  AND token = 'qHWQJKrTuVY9M+0hZCywI1Prn0m2ProWy+EytEeEws0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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