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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c62dd583b01c0d27038d86f582e1ffda9327271bfa1b078b887c642775f09e1' 
  AND token = 'qbTX+WgoKhM61U7ydFAB17ix1CZsjft6x0OF4kfCkto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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