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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f35bbb9227a8d8558406c3855944d4a89a7f83d588aa123cbd68cc8c64821e4' 
  AND token = 'GosHEUsmFVamkJ2gjN19NTTsaZYQ4X5nS/ey+W4xAmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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