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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d035e092741b3e55b2173a4a73cb028a01cfb1583654a45fb58b23f317b0ab3' 
  AND token = 'rlCUBW+/42dfk/nxuKG8mwCN050JibnpHcdx78ez2H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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