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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b071a7256f1652d430a170fce1d870aa8d8fc563fa37fcfa28bbdc1be59a06d' 
  AND token = 'F8qqrc0ayPd21SdX8faCjXmf3H/JUfR7acmU5Vdx+Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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