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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2618375dcc9ad85372d54ea19540981b82f9835bdd2ee8a314472d5786b9ffb' 
  AND token = '8zRSubTFC6ntM43SR/NWVAtYi80jll6iVCS8D4Tqgb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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