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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb2aa58fe0d55ad4974c9dfab0573993f5d0a5e0da7a3969dda8c6baee81be5' 
  AND token = 'VR/fSX5tudjNSi724vNpSakXgQWxeYdt/jDJWYOOYec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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