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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '602b9d1bccbb0ef13000547cbf4fddd8291067ad01422a98e1e571c344ed0238' 
  AND token = '4YNY4f0lCQ7ZfIdr7/aWri2tgvnnb+D/mw7B3SVrvqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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