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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9594e14f66b6ed35664667222ea2e4cab2da4cf16acb6ecaecdbc2ed886e69b' 
  AND token = 'Y+Uw95VtkoVLrGBWWRWRp7gBaAo4Fr+P/EStXKf9o3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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