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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf34a8c3c948e31283062ebd7b141c25d559be790ccc0e5e12db06e45e11ae5' 
  AND token = '9ozeNpWgTgSm6fXzSZ0HUF3BE18nqQ9htgnST361hYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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