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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '128baa3e84e972302f3b2ba7c1e93c17e84aea7f60d668201fe8db2e48a884e9' 
  AND token = '7+Nb53FBOS0580FSx7HYI1yB8ydOAdQ0KdAXIi8Neko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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