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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fab3a643c3ca0d69c2207a81fae75c9544599e41edaeb875dcbe33162187870' 
  AND token = 'g+izohi7E/jv/ifCnycdm6CbWVm+UUt1ViTpvMo5fD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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