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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '716c7a3ff0b05b20a54f590751a97d82cfec9127df7249559b8dad25cf6c6b3e' 
  AND token = 'V982/ZIWkttdpuIP4Yeo3pQjTJoXiNS907wbrA4n5H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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