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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f38da2d4691606d1452437eadc5f1f9e14853408eca85c8ae385cf9df26ad415' 
  AND token = 'oi1OHPkR63FueGGLHrqdu3CTUX/MY2m+2BjYthw1NyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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