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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3366883ed5fe519cd5f3347b1b4fb6b672ed0c2657d4dd1e92dfab4ff113377c' 
  AND token = 'YQgsx8teiyfVzwJrd1ckQXfSFoTMt2yYwOXdKEx55As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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