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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ebc33a6d1dc355d3ee548ab4a1fc61461b6700c1015012b9315860b4cb76751' 
  AND token = '0vzBrEDr4P1WyuUqtRjs8TiTyX5A7zVMzYR4Vybh7I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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