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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb697e0f82734724a94a87547349d8efd0606768aa7b4535f3fdb1f69bca35a' 
  AND token = 'EyfV7QaclFPJzvRyLnSGIf8QTYK8r7Z9+NbtH+03Qbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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