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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa2e58b925c9a81314de16d2cacf165223839bde11235ff14d19b034cc48ed0d' 
  AND token = 'TWYy7DvDX/NPiaJMqAnWyNExswizUngu22CKG6Pt4BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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