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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa0b5e6dca28971e6dc396cf3cf84ec18aeab71d3b88c1171cfb204efb30a33' 
  AND token = 'V36nSj8Wk7y6u9BFNsJzxy6gydG/dq0lpOADRjSPO5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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