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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be35f90ed0847b4e325b3d6f64b58ccf864dfd3f367e0e43b124daa7a49d4cbb' 
  AND token = '9GL4LQ0FHWXymJtR9MpHaG2GOcE5gZqFL1gpAARkkt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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