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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07fe101093fc41989f79ec5e75e4902cdf3f05aeec3d4561f0574fbd08858d3c' 
  AND token = '5dF5m219ccaZ6G+CVD48+ahDJXFzjf86WoAPdXjMu4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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