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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be1e0db88d2c2afd0f3de57d790a6c2edf62b369032673db53ae41f5138085a' 
  AND token = 'iH5ydgMvTQ4htQkwpcEmh8XkylpsjrzF+CEmqNLS3Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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