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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b3eadd4634f71ee0aae256efc2ceac965baa759454f0e382cb590b0fc01ff06' 
  AND token = 'WqDmBYh+n2erUWfaUhFET97VUA69Vq8DNJAgVR2ebYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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