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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e003e42427befc2a0d1f6d531db1c3f4ff000472a9dc05dd24ff1e1475d5668' 
  AND token = 'h/stuhmbJftS8+QMI0mewiRtbkleS0C31x6PP2mK1pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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