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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a253f0b85b2ce7800ca653dd7a851a51fa8527853360c4e395ad9e496d3397b' 
  AND token = 'EYpa0vQrX2JQo6lvc9CwF+hEdUcE/ezAvCNTC43Rxu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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