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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3881444b19acb4eaf3fcb8af0ecbaa888c0d9ee71c810e133b5d3c3ccb119048' 
  AND token = '9q+WsoZ0RIbynA9Z4qBNZhZX0+QhbiP588ZnlgFUlfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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