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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbc5d809866b2ae86b103e16e4741d5477ad109caaf29aba74a5efb4ab770e9a' 
  AND token = '/01CE76fA6gksWMy4bH7LggH95erOMZxakjSVLgr+NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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