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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8040d7426e1246a6d12c925671e79574a30d000cd5293ebb7a7407b657446b98' 
  AND token = '7KuaBGpmklGwCQpCzE7iQwV0IKjZWoHE849eCdMsaBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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