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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af2e5e714258a54ad8854ff5d1757dc714300b8c464842cf1cd1a93953dc98f8' 
  AND token = 'vbao/OuBoyhOfZhGlw8aZ0hdWUMlVT14Q7mVPrbBmX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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