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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e97b50e3c8e16dfed2ae0804c03a80f47629350ef7700c487e3cc10beb5a3ab' 
  AND token = 'MAO9ig3vZWwkKhgBXZpcnNIgjbz1xP3WT8xgEBoYaHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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