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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '068bddc854b78837a6c0261c28419d554276fd28cdfab0d537870cf1ab8b347e' 
  AND token = 'EW/lvOMOW1v1yzit890HU19uXy1OT+l6RcLs1NOd914=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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