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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd47d18983c82e36d3e8a7e32108354e40a89598a9374502d21f85c69a87a35d5' 
  AND token = 'O1l87fSgwfP6F2EJRtatSmC74X9XVZJ3ElROlEtiRtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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